Critical angle for total internal reflection of light of a certain frequency at a denser-rarer boundary is 30°. At what angle should the same light be incident on the boundary from the side of denser medium that the reflected and the refracted rays are mutually perpendicular ?
A
tan –1 (2)
B
tan –1 
C
cos –1 
D
cos –1 
Text Solution
Verified by ExpertsThe correct answer is:
C
= sin30 0 = 
μ = 2
2 sin i = 1. sin (90 0 – i)
tan i = 
⇒ cos i = 
⇒ i = cos –1 
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